dt-bindings: mtd: drop mtd/cortina,gemini-flash.txt

Drop mtd/cortina,gemini-flash.txt since it is nearly already handled by
Documentation/devicetree/bindings/mtd/mtd-physmap.yaml.

We add jedec-flash to list of compatible because one board (gemini-dlink-dns-313.dts) needs it.
See commit a10d862 ("ARM: dts: Fix the DNS-313 flash compatible")
The flash on the DNS-313 needs to be probed as JEDEC, it does not conform to the common CFI standard.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20220211120842.3388592-1-clabbe@baylibre.com

Author: montjoie

Documentation/devicetree/bindings/mtd/cortina,gemini-flash.txt

@@ -44,7 +44,9 @@ properties:
               - numonyx,js28f128
               - sst,sst39vf320
               - xlnx,xps-mch-emc-2.00.a
-          - const: cfi-flash
+          - enum:
+              - cfi-flash
+              - jedec-flash
       - items:
           - enum:
               - cypress,cy7c1019dv33-10zsxi
@@ -127,6 +129,20 @@ required:
   - compatible
   - reg
 
+if:
+  properties:
+    compatible:
+      contains:
+        const: cortina,gemini-flash
+then:
+  properties:
+    syscon:
+      $ref: /schemas/types.yaml#/definitions/phandle
+      description:
+        Phandle to the syscon controller
+  required:
+    - syscon
+
 # FIXME: A parent bus may define timing properties
 additionalProperties: true